Your comment doesn't really make sense. A swage connection is done by a tool and requires no combustibles. If you needed combustibles then you need a license to handle those combustibles. And you need special tools to decide how much of those combustibles to add. You also need special tools to actually add the combustibles to the system. And before that, you need special tools to prep the system for those combustibles. And before you can do that, you need special tools to make sure your system is adequately sealed before even attempting to get the system ready to add the combustibles.

Maybe next time you should spend the few grand on all those tools, the hours it takes to learn how to use them, and can do it yourself!